package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Autowired
    private UserServiceImpl userService;

    @Override
    public Result follow(Long id, Boolean isFollow) {
        Long userId = UserHolder.getUser().getId();
        String key = "follows" + userId;
        if (isFollow){
            Follow follow = new Follow();
            follow.setUserId(UserHolder.getUser().getId());
            follow.setFollowUserId(id);
            this.baseMapper.insert(follow);
            stringRedisTemplate.opsForSet().add(key, id.toString());

        } else {
            this.baseMapper.delete(new QueryWrapper<Follow>().eq("user_id", userId)
                    .eq("follow_user_id", id));
            stringRedisTemplate.opsForSet().remove(key, id.toString());
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long id) {
        Integer integer = this.baseMapper.selectCount(new QueryWrapper<Follow>().eq("user_id", UserHolder.getUser().getId())
                .eq("follow_user_id", id));
        return Result.ok(integer > 0);
    }

    @Override
    public Result CommonFollow(Long id) {
        String key1 = "follows" + id;
        String key2 = "follows" + UserHolder.getUser().getId();
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(key1, key2);
        if (intersect == null || intersect.isEmpty()){
            return Result.ok(Collections.emptyList());
        }
        List<Long> collect = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> res = userService.listByIds(collect)
                .stream()
                .map(item -> BeanUtil.copyProperties(item, UserDTO.class))
                .collect(Collectors.toList());


        return Result.ok(res);
    }
}
